Sturdy ceramic mold with swirly donut designs for adding texture to bottle rings. Mold measures about 6″ x 4″, and each donut cavity is about 2″ wide. Sized to fit donuts cut from bottle necks, but can be used with any fusible glass. Fused donuts are great for jewelry, chimes, Ships with instructions and firing schedule. Not for use in Quickfire or Microwave kilns.